After MANY lackluster performances surfaced online, it's safe to say MiMi is phoning in her concerts these days. Now, don't get us wrong, we know that Miz Carey has never been a dancer — but she seems particularly underwhelmed with her work lately.

The insider explained that one of the reasons the New York native is no longer working with her tour choreographer is because he decided to change the backup singers' positions for the New Year's Rockin' Eve performance without running it by Mimi or her team.

The confidante confessed that the Pennsylvania native had instructed the vocalists to move off the stage — placing them at the base of the risers — so there could be more room for the momma-of-two's backup dancers.